Processes and Forms of Alluvial Fans

Alluvial fans are a conspicuous conical landform commonly developed where a channel emerges from a mountainous catchment to an adjoining valley (Figs. 14.1 and 14.2). Although present in perhaps all global climates, fans in deserts have been the most studied due to their excellent exposure and ease of access. Drew (1873), working in the upper reaches of the Indus River valley in the western Himalaya of India, provided the earliest illustrations and scientific description of desert alluvial fans (pp. 445–447):

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